Microwave oven



FIG. 1 is a front, side and top perspective view of a microwave oven showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof from the left of FIG. 2;

FIG. 4 is a side elevational view thereof from the right of FIG. 2;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof.

Apart from the contours visible in the other views, the bottom thereof is plain and unornamented. 

The ornamental design for a microwave oven, as shown and described. 